If you use Grodan rockwool, you can get a Grodan metering system that tells you precisely what’s going on in your rockwool.

If you’re not familiar with rockwool, it’s one of the purest, most inert root zone media materials you can use in hydroponics marijuana growing.

Grodan makes a wide range of rockwool types with different qualities of drainage, grain, packaging, and other factors.

Other than pure water culture such as deep water culture and aeroponics, using rockwool as a root zone substrate is a great way to do hydroponics marijuana growing with total control over plant nutrition, pH, oxygenation, and watering.

On the other end of the root zone spectrum is soil.

Some marijuana growers prefer soil, but they’ll admit soil is challenging to work with because you have a very hard time monitoring and controlling soil pH and soil moisture.

Most soil meters we’ve used have been absolute junk. You’ll see soil pH and soil moisture meters that retail for $25, and they just don’t work at all. They’re toys.

These units aren’t cheap, but if you’ve been growing cannabis in soil and experienced the harsh effects of bad soil pH or soil that’s too wet or too dry, you benefit by spending your money on soil meters that actually work.

For measuring water pH, our marijuana grow team has ultimate faith in the Bluelab combo meter that measures pH and parts per million very accurately.

If you use a BRIX meter and find that your marijuana plant tissue has a BRIX rating lower than 12, you should do what most professional marijuana growers do: add carbohydrates, beneficial microbes, and enzymes to your marijuana root zone.

When marijuana growing expert Michael Straumietis visits marijuana gardens to help growers maximize plant health and harvest yield, the first thing he does is a safety check. He's looking for defective…

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